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<?php
/**
* Copyright (c) 2014 Lukas Reschke <lukas@owncloud.com>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
namespace OC;
class HTTPHelper {
const USER_AGENT = 'ownCloud Server Crawler';
/** @var \OC\AllConfig */
private $config;
/**
* @param \OC\AllConfig $config
*/
public function __construct(AllConfig $config) {
$this->config = $config;
}
/**
* Returns the default context array
* @return array
*/
public function getDefaultContextArray() {
return array(
'http' => array(
'header' => 'User-Agent: ' . self::USER_AGENT . "\r\n",
'timeout' => 10,
'follow_location' => false, // Do not follow the location since we can't limit the protocol
),
'ssl' => array(
'disable_compression' => true
)
);
}
/**
* Get URL content
* @param string $url Url to get content
* @throws \Exception If the URL does not start with http:// or https://
* @return string of the response or false on error
* This function get the content of a page via curl, if curl is enabled.
* If not, file_get_contents is used.
*/
public function getUrlContent($url) {
if (!$this->isHTTPURL($url)) {
throw new \Exception('$url must start with https:// or http://', 1);
}
$proxy = $this->config->getSystemValue('proxy', null);
$proxyUserPwd = $this->config->getSystemValue('proxyuserpwd', null);
if (function_exists('curl_init')) {
$curl = curl_init();
$max_redirects = 10;
curl_setopt($curl, CURLOPT_HEADER, 0);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 10);
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
curl_setopt($curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
curl_setopt($curl, CURLOPT_USERAGENT, self::USER_AGENT);
if ($proxy !== null) {
curl_setopt($curl, CURLOPT_PROXY, $proxy);
}
if ($proxyUserPwd !== null) {
curl_setopt($curl, CURLOPT_PROXYUSERPWD, $proxyUserPwd);
}
if (ini_get('open_basedir') === '' && (ini_get('safe_mode') === false) || strtolower(ini_get('safe_mode')) === 'off') {
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($curl, CURLOPT_MAXREDIRS, $max_redirects);
$data = curl_exec($curl);
} else {
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, false);
$mr = $max_redirects;
if ($mr > 0) {
$newURL = curl_getinfo($curl, CURLINFO_EFFECTIVE_URL);
$rcurl = curl_copy_handle($curl);
curl_setopt($rcurl, CURLOPT_HEADER, true);
curl_setopt($rcurl, CURLOPT_NOBODY, true);
curl_setopt($rcurl, CURLOPT_FORBID_REUSE, false);
curl_setopt($rcurl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($rcurl, CURLOPT_USERAGENT, self::USER_AGENT);
do {
curl_setopt($rcurl, CURLOPT_URL, $newURL);
$header = curl_exec($rcurl);
if (curl_errno($rcurl)) {
$code = 0;
} else {
$code = curl_getinfo($rcurl, CURLINFO_HTTP_CODE);
if ($code == 301 || $code == 302) {
preg_match('/Location:(.*?)\n/', $header, $matches);
$newURL = trim(array_pop($matches));
} else {
$code = 0;
}
}
} while ($code && --$mr);
curl_close($rcurl);
if ($mr > 0) {
curl_setopt($curl, CURLOPT_URL, $newURL);
}
}
if ($mr == 0 && $max_redirects > 0) {
$data = false;
} else {
$data = curl_exec($curl);
}
}
curl_close($curl);
} else {
$url = $this->getFinalLocationOfURL($url);
$contextArray = $this->getDefaultContextArray();
if ($proxy !== null) {
$contextArray['http']['proxy'] = $proxy;
}
$ctx = stream_context_create(
$contextArray
);
$data = @file_get_contents($url, 0, $ctx);
}
return $data;
}
/**
* Returns the response headers of a HTTP URL without following redirects
* @param string $location Needs to be a HTTPS or HTTP URL
* @return array
*/
public function getHeaders($location) {
stream_context_set_default($this->getDefaultContextArray());
return get_headers($location, 1);
}
/**
* Checks whether the supplied URL begins with HTTPS:// or HTTP:// (case insensitive)
* @param string $url
* @return bool
*/
public function isHTTPURL($url) {
return stripos($url, 'https://') === 0 || stripos($url, 'http://') === 0;
}
/**
* Returns the last HTTP or HTTPS site the request has been redirected too using the Location HTTP header
* This is a very ugly workaround about the missing functionality to restrict fopen() to protocols
* @param string $location Needs to be a HTTPS or HTTP URL
* @throws \Exception In case the initial URL is not a HTTP or HTTPS one
* @return string
*/
public function getFinalLocationOfURL($location) {
if(!$this->isHTTPURL($location)) {
throw new \Exception('URL must begin with HTTPS or HTTP.');
}
$headerArray = $this->getHeaders($location, 1);
if($headerArray !== false && isset($headerArray['Location'])) {
while($this->isHTTPURL($headerArray['Location'])) {
$location = $headerArray['Location'];
$headerArray = $this->getHeaders($location);
}
}
return $location;
}
}
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